| This article has been：Browse 1170Times Download 955Times |
scan it! |
|
|
| DOI：10.13522/j.cnki.ggps.2017.0621 |
|
| The Impact of Drought and Planting Density on Growth and Yield of Maize |
|
LIANG Xuanhe, XU Chen, ZHAO Xin, CHEN Baoyu, HU Yu, CAO Tiehua
|
|
1.Jilin Agricultural University, Changchun 130118, China; 2. Jilin Acadamy of Agricultural Sciences, Changchun 130033, China; 3.Yanbian University, Yanji 133002, China
|
| Abstract: |
| 【Objective】 The overarching objective of this paper is to elicit the effects of drought on growth and yield of maize planted under different densities in attempts to experimentally find suitable planting density at different drought level. 【Method】 The experiments were conducted in a mobile rainproof shelter, and the irrigations were determined based on real-time soil moisture measurements. We tested five planting densities: 50, 55, 60, 65 and 70 thousand/hm2; and five irrigation treatments: keeping soil moisture at 75%±5% of the field capacity during the entire growth season (CK), moderate water stress at the jointing stage by keeping the soil moisture at 50%±5% of the field capacity (T2), moderate water stress at the gain-filling stage by keeping the soil moisture at 50%±5% of the field capacity (T3), severe water stress at gain-filling stage by keeping the soil moisture at 40%±5% of the field capacity (T4). 【Result】 Both moderate and severe water stresses impacted the growth and ultimate yield of the maize. A moderate water stress at jointing stage did not have a noticeable effect on plant height and dry matter accumulation, but reduced the stem diameter and leaf area index. Moderate and severe water stresses at the grain-filling stage both significantly impacted the morphological index and dry matter accumulation, with severe water stress resulting a yield reduction by 30.87% compared to the CK. 【Conclusion】 The best planting density under normal irrigation or with moderate stress is 65 000 plants/hectare, while under severe water stress the density of 60 000 plants/hectare achieved the highest yield. Increasing planting density or water stress will reduce yield. In dry regions, therefore, decreasing planting density is a way to reduce yield loss. |
| Key words: maize; drought; density; growth and development; yield |
|
|
